At least 74 countries around the world have been affected by an international ransomware cyberattack.

Costin Raiu, director of Global Research and Analysis Team at cyber security company Kapersky Labs, said: "Currently, we have recorded more than 45,000 attacks of the WannaCry ransomware in 74 countries around the world, mostly in Russia. It's important to note that our visibility may be limited and incomplete and the range of targets and victims is likely much, much higher."

Prime Minister Theresa May said in a statement shortly after 7pm: "We are aware that a number of NHS organisations have reported that they have suffered from a ransomware attack. This is not targeted at the NHS, it's an international attack and a number of countries and organisations have been affected."

So far, we have recorded more than 45,000 attacks of the #WannaCry ransomware in 74 countries around the world. Number still growing fast.